Neu 1515 & MMM Temp Poll
 

I know I've asked this before, but...

I put a TeknoNeu 1515/1Y and MMM and 4s in my E-Maxx that is now up to 11.5lbs. I ran hot so I got rid of the big Moabs and put some Terra-Izers on that are slightly smaller than stock.

I've geared everywhere from 25mph to 50mph and everywhere in between. Changing gearing doesn't change temps. After only 5 minutes of running, I get:
160*F on the motor
120*F on the MMM
115*F on the lipos

I know the faq says that 160*F is hot, so I am not happy with this. there is no binding in the drivetrain, all bearings are good. slipper is too tight if anything. mesh is right. i'm at a loss. Neu himself told me to just keep it under 200*F and not worry, but i keep reading how others are running the same setup with good temps.

i finally gave up and put a fan on it, but i'd like to take it off if i could get some help. any thoughts?

http://home.earthlink.net/~webhost/traxxas/fan/1.jpg

http://home.earthlink.net/~webhost/traxxas/fan/2.jpg

http://home.earthlink.net/~webhost/traxxas/fan/3.jpg

the 24V fan (running off 4s) got me down to 140*F after 5 minutes and 160*F after 10 minutes.

You should put a bigger fan, like 24" x 24", your's too small:lol::rofl:

that's a 60mm that is rated for ~20cfm at 24V.
i'll tell you what, i hooked it up to a variable power supply, and the last 1.2V make all the difference in the world. i'm not getting any where near 20cfm at 16.8V.

a 40x40 would be more than adequate but 160* really isn't that hot

I run a Tekno Neu 1515/1.5d/f 4s in my converted slayer weight 9.75 lbe includes a 4s 6000 maxamps battery and I am geing in the 140 motor below 140 on the MMM and the battery never even gets warm.The Slayer does have mech. brakes though.The Slayer is the first rtr kit I have had.I noticed that the front and rear difs didnt spin as freely as any kits I have built.I put alloy diff cups and alloy diff cases.My point is check that the drivetrain is not binding in any way.Just a thought

I heard that the tekno neu motors run hotter than the regular neu motors.

That's weird. I thought the tekno neu's were on par with the real neus.

The only differance I have noticed between the Neu and Tekno Neu is nothing.I have 1 of each both 1515/1.5d/f.My original Neu also is the older style with the stronger magnets.

your temps arnt "THAT" hot but compare to mine its a little off..


Ambient - 94
MM - 120
NEU 1515 1.5D - 130
4s MA Battery - 99

my xray 8xb has a 1515 and weighs less then your maxx and my motor runs anywhere from 135 to 175 it nevers gets over 175 even after 30 minutes so ya i was told by castle to keep the running temps under 180 and as long as it never got over 200 there wouldnt be any damage at all so loose the fan man your temps arent hurting anything

i guess the fact that the tekno is sealed makes it run a little warmer.
thing is, after 10 minutes with no fan, i get 180*F.
i'd like to be able to run it for the full 20 minutes my batts can dish out.

sometimes i think i just might be a little to heavy on the throttle. i'm always laying in to it so that the tires rip and spit up dirt and leaves and grass; non-stop for the full time i'm driving. but then again, i'm sure there are plenty of you that run way harder.
what gets me is that changing the gearing has no effect on temps.

Maybe you shoul dtry a different motor a Neu 2d ? I know you have a family and stuff and its expensive but ya know sometimes you get a lemon. Everything else has been tried, I can send you a 1.5d barely used and that goes 9 mph faster and gets to the temps you are at.

may i ask what gearing are you running?

Check the bearings on the motor, bad bearings can cause high temperatures and it seems like the bearings Neu uses isn´t that good, I´ve heard of several neu´s with bad bearings

Running a NEU 1515/1Y/F, with MMM. G3 chassis, v1 slipperential, UE diffs. Stock tires some of the time, otherwise Proline Beadlock with Big Joe tires. 11lbs with stock tires, 13 with the Big Joe's. Driving in the park on grass. Normal temp after about 20 minutes, ESC 110f, Motor 120F, batteries 85F. Batteries are 1-2s-8000 with 1-3s-8000 (5s total). Gearing is M1 spur 40, pinion 17. No additional fans for cooling.

I have a G2 EMAXX, MMM with Tekno neu 1515/2.5d 6S2P A1232 EMAXX/V2 Sliperrential/Big joe and Save X tires (almost the same diameter)...13lbs truck

Temps for multiple run
Motor: 120-140*F(Max temp)
MMM: 110-120*F
Battery: 80-100*F

last time I've had a high motor temp was the screw on the slipperential gear came a bit loose another one was when the Spur slipper clutch was loose....but once they got tightened I never reached higher temps than posted above

So with the Neu motors, what rpm should we be shooting for when selecting the gearing and batteries. I've been running through the speed calculator time and time again, and most set ups that I like put me at about 24K for RPM's at top speed. I feel like this is underworking the motor, and may not be in the efficiency range.

all my temps are about the same. I'm in a 13lb Muggy on 4800mah 6S, tekno 1515 1y, 12t pinion, 46t spur, and I was told the same temps by castle. Maybe these tekno version do run hotter for some reason. gearing HAS affected me though, as I hit 180 on the motor (I let it cool down) with an 18t(!) pinion, which was not really driveable anyway.

I normally try to stay within 30K+++ RPM preferably on the lower range....

I've been getting my motor/battery combos lately that spec out in the ~38K rpm range with 4-6S lipo and Neu 1515/1512 motors.

I had a running concern myself that my temps were always high (around 150-170) after about 5 or so minutes of running, but one day I said so what if I end up killing the motor and just kept running. To my surprise I temped things at the end of about 15-20 minutes and the temps were still the same 150-170 range.

This took a real burden of concern off my shoulders as I realized that even though 160 may seem high, it is still well within the motor operating range and that was the stabilized high temp on the motor.

FWIW, my Neu always runs about 150 to 160 no matter what gears/tires I put on it. ESC and batt temp are another matter though, lol.

thanks for the offer. i'll keep it in mind, but i'm not ready to give up on this one yet.

i've been all over the place with 54, 56, 58, 62, 65 and 68T spurs along with 16, 18, 20, 22, 24, 26T pinions.
at the moment, i'm running 22/65, but after the fan job, i was getting ready to drop 26/62 back in.
again, didn't really see a difference in temps on the motor when changing gearing. only time i saw any difference at all was the MMM and batts got a little warmer on 26/56, like MMM =140*F and batts = 130*F.

i have another thread going about how to open up this motor. i've been curious about just that. i might as well swap out the bearings when i do check them out. any recommendations?

sorry about the multiple posts for the quotes. i was lazy and didn't know of an easier way.
thanks for all the help.
i'm glad to hear from some of you that temps didn't change when regearing or chaning tires. i started out with moabs and took them off because of the heat. looking back, temps were no worse.

this hobby just seemed so expensive at the time i bought the brushless system, i didn't want to burn it up. i got the new e-maxx in january, spent 3 months making it stronger then went brushless after my third evx-2 died and took a lipo with it. it's been a while since i spent some money on this. i guess i may just be up to running it until lvc cuts.

i think i'll still change the motor bearings though. anyone know the size and if i should go ceramic for these?

Just as a FYI, you can use the multi-quote function to quote multiple posts in a single reply. In each post you want to quote, in the lower right-hand corner of the window there are three icons, it's the middle one. Just click on that in each post you want to quote, then when you hit reply, it pops them all into a single reply for you to type replies to. It's exactly what I did to quote all three of your last posts above.

thanks skellyo. that's the best off topic help i've gotten on a forum period.
i've never seen that on any other forum. (then again, i didn't see it on this forum)

Glad to help out when I can. :great:

after taking the rear cover off, i pulled the rotor out and found a few things:
1) it is a real tight fit between the rotor and windings
2) it was real dirty in there (full of actual dirt/sand)
3) it looks like the dirt/sand had scratched the surface of the rotor and windings

maybe the friction of the dirt/sand was making things hot?
i cleaned it out real well, lubed up the bearings (which were fine) and put her back together. only this time i covered up the two unused mounting holes with foil tape and slipped some fuel tubing over the three leads coming out of the motor to totally seal the can. i haven't ran it yet, but we'll see...

The pics ive seen of them opened they are mauled up bad, but work fine, so dont be too concerned about that. Hope it runs better for you

hmm, ive noticed mine got hot (150-170) on the track after a 6 minute race, in a 4kg bugggy (1512 2d, 4s). i then did a 15 minute main thingy, and after the 6 minutes i came in every 2 laps to check the temps. it peaked at around 8-9 minutes at 178F which i thought was super dooper hot, so i ran a real easy lap and next reading was only 162F... again i did a normal lap and it was 150F...

im really confused but it seems like driving style makes a HUGE difference, in the space of 3 minutes (2 laps on a huge track) it can cool down with a gentle finger... so im not really concerned now as i know it seems like it hits the max it will go then levels off... which is good. even running around the yard at 10mph gets it to 150F after a few minutes. i think they just like a certain temperature and unlike feigaos, they stay at the temp for their entire lifespan!

gearing down didnt help so i just geared up again :)

I have been having a lot of problems with my MMM with NEU motors. My setup is as follows:

Losi 8ight T-
Tekno RC bruhsless kit (clutch/mechanical brake setup)
13/48 gears
Mamba Monster Max
NEU 1515 1.5d
NEU Engery 4s 5000mah 25c lipos
JR 9100t and JR9100s servos
Airtronics 2.4ghz receiver w/ M11 Transmitter
10 guage wiring througout

Losi 8ight B-
Tekno RC bruhsless kit (clutch/mechanical brake setup)
14/48 gears
Mamba Monster Max
NEU 1512 2.5d
NEU Engery 4s 5000mah 25c lipos
JR 9100t and JR9100s servos
Airtronics 2.4ghz receiver w/ M11 Transmitter
10 guage wiring througout

I got 3 MMM, two for use and one for backup. Well after only using each once! All three are back at Castle for repairs. Castle has told me they have stopped production/shipment on version2 untill further notice. They said the problems they thought they fixed apparently are not fixed.

My 8ight T on its maiden run at the tracks, lasted about 20 minutes and the lipo cut off kicked in. These were the temps:

Motor= 130's
ESC= 130's
Battery= 120

I took it out the next day to run up and down my street and it died after 5 minutes. The ESC would not light up unless I unplugged it from the receiver. I of course swapped parts around to make sure it was the ESC and it was. The only way the ESC turns on is if I disconnect it from the receiver. CC said they have seen this in about 5% of the new v2 batch so please return to them for repair.

I took the Losi 8ight B out for its maiden run at the tracks, and after about 20minutes it died. Brought it back in and temps were as follows:

Motor= 130's
ESC= 130's
Battery= 120's

I thought it died because of lipo cutoff, so after about 20 minutes of letting everything cool down I took out a fully charged lipo and as I was plugging it in the ESC went up in flames! Turns out one of the capacitors (3 total) blew up. CC said this is because the ESC was working too hard to keep up with amperage draw because the battery was not enough. I thought to myself, with a NEU 2050kv motor and a $250 NEU 4s 25c 5000mah lipo if this is too much for the ESC to handle then the ESC's got problems! But they said send it in and they will repair.

I took the Losi 8ight T out with the third ESC and after 5 minutes the car died. Brought it in and turns out the top half of the ESC fell off from the base when I was driving and it tore out the power swtich and fan connectors to the circuit board! Again, CC said this was a design flaw they are working on to fix!

So I waited like 5 months for MMM v2, just to play with all three for less than an hour and have to wait another few months!

Above is just food for thoughts for those considering MMM. I dont know, maybe Im just bad luck? If you guys look at my pictures on the link below I went out of my way to make sure all wiring and cabling is as solid and clean as possible! Heat was obvisously not an issue with these three failures.

http://good-times.webshots.com/album/562025697XGWJlX

Your temp gun must be out of whack. No way will a Lipo get to 220F and not have issues.

skellyo,

You are free to call NEU or CC and ask about battery temps. You can also search the forums on battery temps. Keep in mind also this is after 20 minutes of run time. The link below is the temp gun I am using, I am assuming its a good temp gun.

http://www.amainhobbies.com/product_...oducts_id/2246

skellyo,

My BAD! I just caught my own mistake! All temps should be in the 100's! Thanks for the correction!

LOL, no problem.

Ran mine for about a half hour today:

MMM sttings:
Brake/reverse proportional w/ reverse
Brake 50%
Reverse throttle 40%
Punch 0%
Drag brake 10%
Start power high
Motor timing 10
Throttle curve linear

batts: 116F
Neu: 123F
MMM: 103F
ambient: 80F

well, i just finished running mine until lvc cut (just shy of 20 minutes).

batts: 124*F
esc: 133*F
motor: 157*F
ambient: 82*F

it's now geared 24/65 = 42mph with 0.5" ballooning radius.
the fan was on it.

looking at your MMM settings mkrusedc, mine are just about 180* out.
MMM sttings:
Brake/reverse proportional w/ reverse
Brake 40%
Reverse throttle 40%
Punch 100%
Drag brake 20%
Start power low
Motor timing 0
Throttle curve linear

looks like you set yours up to haul @$$ and i've set mine up for low temps. i think i should try it your way.

I am using 51/20 gearing, no fan. I'll post a vid latter as soon as I get it edited. My Mashers balloon huge!

i changed the timing from 0 (lowest) to 5 (low).
after 5 minutes of running, the temps are 10*F cooler. (130*F with the fan)
i was going to keep going but my efforts were tabled because a 30' long cartwheel that led to a bent CVD.